Converters and offline charts are no longer necessary for Renko charts. There are 3rd party Renko chart EA and indicators and also several in Market from Sergey Deev (work2it).

This eliminates a lot of problems that used to occur with the M1 chart with the converter EA creating an offline chart that would sometimes freeze. Also you don't have to open 2 charts for each Renko chart you want. No reloading data when you close Renko charts and the M1 chart.